Granted Patent
Utility
US 4,997,694 · App. 07/405,330
Cellular ceramic and foam materials
Inventor:
David J. Legare
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Sep 11, 1989
Inventor
David J. Legare
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.